Locking-nut



(ModeL) J. B. OALKINS.

Looking Nuts.

No. 234,239. Patented Nov. 9,1880.

N. PETERS, FHQTWUTHOGRAFHER. WASHINGTQN. D Ov UNITED STATES PATENT OFFICE JAMES B. OALKINS, OF PACIFIC, MISSOURI.

LOCKING-NUT.

SPECIFICATION forming part of Letters Patent N0. 234,239, dated November 9, 1880.

(Model) To all whom it may concern Be it known that I, JAMES B. CALKINS, of Pacific, Franklin county, State of Missouri, have invented a new and useful Improvement in Locking-Nuts, of which the following isa specification.

This invention consists in making a slight groove or notch at one or more points on the edge of the flat surface of the nut through which the screw passes, and when the nut is screwed down and the surfaces are brought together the nut is locked or prevented from turning by raising a small piece of the opposing surface filling up the notch or notches in the nut. This can be done with a common punch or ordinary diamond-pointed chisel, which is in every-day use.

When the said piece is raised, filling the notch in the nut, it cannot he accidentally knocked off, as it would be if raised on the out side of the nut without the notch to protect it. The chisel forces the piece into the notch like a wedge, firm and solid, leaving an even surface on the outside the same as before the piece was raised.

I do not claim an instrument for raising the metal on the outside of the nut, as shown in M. H. Doolys patent, December 5, 1876.

l attain these objects in the manner illustrated in the accompanying drawings, in which- Figure 1 represents a common nut now in use, presenting notches A A A A cut on its edge; and Fig. 2, notches B B, filled by raising a piece of the adjoining surface, which prevents the nut from turning.

Having thus fully described my said invention, what I claim islhe improvement in locking-nuts, which consists in providing the nut with notches in 40 JAMES B. ()ALKINS.

Witnesses A. VEEoH,

JAMES M. OALKINs. 

